天文現象及活動

中學天文及環境教育考察課程 – 天文及生物


天文及生物

日期:(可供填選)
●2017.04.21(五) ~ 2017.04.22(六)
●2017.04.28(五) ~ 2017.04.29(六)
●2017.05.12(五) ~ 2017.05.13(六)
地點:長洲 明愛賽馬會明暉營 及 明愛陳震夏郊野學園
對象:中一至中六學生 (每校須有教師帶領)
名額:45

收費課程,2015.09.13 13:00 起,參加者必須報名,最多可填選三個課程日期志願,2015.09.15 17:00 截止,先到先得

【訊息由張詠倫提供】

此活動由明愛陳震夏郊野學園主辦。

穀雨


5時27分穀雨,太陽黄經30度。

天氣較暖,雨量增加,是北方春耕作物播種的好季節,因為有雨水滋潤大地。

大爆炸核合成的實驗挑戰 – 鋰豐度問题


SEMINAR:- Experimental Challenge to the Big-Bang Nucleosynthesis(BBN) – The Lithium Problem in BBN

The primordial nucleosynthesis right after the big bang (BB) is one of the key elements that support the BB model. BBN is well known that it produced primarily light elements, and explains reasonably well the element abundance. However, there remains one serious problem, call the Li problem in BBN. The BBN simulation together with recent detailed micro-wave background measurements BBN explain most light elements including D, He-4, etc, but the Li-7 abundance is over predicted roughly by a factor of three. 
 
The primordial Li-7 was considered to be produced mostly by the electron capture of Be-7 in the late stage of BBN. Thus, the question for nuclear physics side is whether Be-7 is overproduced or less destructed during the BBN stage. Since the production of Be-7 is by the He-3(α,γ) which is quite well known, the problem may be the destruction rate of Be-7. The Be-7(n,p) reaction is considered to be the main destruction reaction, but it is well investigated and thus it seems hard to change the rate by a factor of three. The next possible channel was Be-7(n,α) reaction, and almost no experimental works reported before. Recently, several experiments were performed or being performed by the direct and indirect methods. I will discuss these reaction studies of Be-7(n,α), including our activities and the result. The conclusion is that the reaction rate proposed by Wagoner et al. and currently being used is roughly one order of magnitude too large. Thus, the Li problem has not been solved, giving a more difficulty. 
 
時間:2017.04.20(四) 16:30
地點:香港大學 莊月明物理樓522室
講者:Prof. Shigeru KUBONO (東京大學 理化學研究所仁科加速器研究中心)
語言:英語

免費會議,歡迎參加

#99

此活動由香港大學物理系主辦。

冥王星合月


22時41分,冥王星合月,冥王星在月球南2.55度。

天文嘉年華


觀眾可透過先進星象投影系統,欣賞各有特色的四季星空。此外亦有專業導師將遠在天邊的八大行星帶到太空館內作介紹,讓大家近距離欣賞行星表面的細節。甚至可以透過天文望遠鏡,親眼窺探月球、行星及其他天體的廬山真貌。活動包括「星空巡禮」、「魔幻行星」及「鏡中星空」三節,有興趣的人士可於活動時間內,於太空館各環節地點輪候參加。

時間:2017.04.18(二) 19:00 ~ 21:00
地點:香港太空館 何鴻燊天象廳、演講廳及天台
主持:(星空文化館)

免費活動,歡迎公眾參加
候備:如天氣欠佳,活動內容將作調整

此活動由香港太空館主辦。

(重播)零距離科學3 – 太陽系的秘密


科學家陸續發現到愈來愈多太陽系以外的行星。這些離奇古怪的天體和行星系統令科學家不得不重新思考太陽系的形成之謎。原來太陽系的行星並非從誕生一刻就在固定的軌道上運行。專家估計,有些行星曾經向內遷移,有些則被彈射到太陽系的外圍,甚至有理論指,太陽系中還有一個消失了的行星。太陽系並非一直以現在的方式運作,它也經歷過一些很激烈的變化,因此,地球的存在絕對算得上是奇蹟。

時間:2017.04.17(一) 12:00 ~ 13:00 (重播)
頻道:港台電視31 及 港台電視31A

#100

此活動由香港電台TV主辦。

土星合月


02時19分,土星合月,土星在月球南面3.23度

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